Comprehensive side-by-side analysis of efficiency ratings, specifications, and performance metrics
Head to Head
Grant
Boulter Bonus 40/65
Boulter • 85.5%
Both Boilers
Available FREE through ECO4 scheme
Boulter Bonus 40/65 offers superior efficiency at 85.5%, making it the better choice for long-term savings.
Both Boulter Bonus 40/65 and Grant Combi 70 Mk II are available at no cost through the government ECO4 scheme. Take the next step today.
✓ Government Approved Scheme ✓ No Hidden Costs ✓ Professional Installation ✓ Energy Efficient
